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Home >> GMC >> 1983 >> Forward Control 6.2 J, Automatic, 400/M40 >> Repair and Diagnosis >> Electrical >> Charging Systems >> Alternator & Regulator - Models W/Integral Regulator >> On-Vehicle Testing >> Notes

On-Vehicle Testing: Notes

NOTE: Before making electrical checks, visually inspect all terminals for clean and tight connections. Check alternator mounting bolts and drive belt tension. DO NOT  ground No. 2 lead wire. Battery must be in good condition to test charging system.